Blog Posts | RBDIMMER

7 Articles

TRIAC × Feb 2026 ×

AC Dimmer Doesn't Turn Off: Residual Glow at 0%

Feb 26, 2026

0 592

FAQ

TL;DR: Setting the dimmer to 0% does not guarantee the lamp turns off. TRIAC holding current keeps the switch conducting at low loads. Fix: call dimmer.setState(OFF) or setMode(OFF_MODE) instead of se...

ac-dimmer halogen incandescent TRIAC troubleshooting tutorial

Which AC Dimmer Module to Choose: Complete Buyer's Guide

Feb 26, 2026

0 621

FAQ

TL;DR: Three questions determine your choice: (1) load type — resistive (heater, incandescent) or inductive (motor); (2) load power in watts → calculate amps → pick a rating with a ×1.3 safety margin;...

ac-dimmer Arduino buyer-guide dimmerlink ESP32 TRIAC tutorial

TRIAC Overheating: AC Dimmer Runs Hot or Burns Out

Feb 26, 2026

0 385

FAQ

TL;DR: A TRIAC is an active device with a voltage drop of ~1.2V. At load currents above 2A it dissipates several watts as heat. Without thermal management: overheating, thermal protection triggering, ...

ac-dimmer Arduino TRIAC troubleshooting

AC TRIAC Dimmer Is Not PWM: How Phase-Cut Dimming Works

Feb 26, 2026

0 482

FAQ

TL;DR: analogWrite() and PWM don't work with an AC TRIAC dimmer. A TRIAC is not a resistor or a DC transistor. It regulates power using phase-cut control : it opens at a precisely calculated moment ea...

ac-dimmer Arduino ESP32 TRIAC troubleshooting

LED Lamps with AC Dimmer: TRIAC or MOSFET — Compatibility Guide

Feb 26, 2026

0 553

FAQ

Short answer: There are two types of AC dimmers: TRIAC (leading edge — for incandescent bulbs, halogen, heaters) and MOSFET AC dimmer (trailing edge — purpose-built for LED lamps). If an LED lamp flic...

ac-dimmer Arduino LED MOSFET trailing-edge TRIAC tutorial

Trailing Edge vs Leading Edge: Which Dimmer Method to Choose

Feb 26, 2026

0 660

FAQ

Short answer: Leading edge is the standard TRIAC dimmer — it opens the load in the second half of each AC half-cycle (best for incandescent bulbs and heaters). Trailing edge is a MOSFET dimmer — it op...

ac-dimmer Arduino leading-edge LED MOSFET trailing-edge TRIAC tutorial

LED Flickering with AC Dimmer: TRIAC or MOSFET — Causes and Fixes

Feb 26, 2026

0 536

FAQ

Short answer: LED flickering with an AC dimmer has three distinct root causes. Types 1 and 2 are caused by TRIAC architectural incompatibility with LED lamps — the hardware fix is a MOSFET AC dimmer (...

ac-dimmer Arduino ESP32 flicker LED MOSFET TRIAC tutorial

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